最近の z~7z~7--8 lbg 8 lbg 探査kajisawa/semi/zydrop...最近のz~7z~7--8 lbg 8 lbg...
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(Microsoft PowerPoint - zY-dropout
[\214\335\212\267\203\202\201[\203h])2009200910102828
McLure et al. 2009 arXiv:0909.2437 --- photo-z SED fitting
Labbe et al. 2009 arXiv:0910.0838 --- +IRAC stellar mass
Oesch et al. 2009 arXiv:0909.5183 --- morphology
GOODSGOODS--S: HST/WFC3S: HST/WFC3
GOODSGOODS--S: VLT/HAWKS: VLT/HAWK--II
Wilkins et al. 2009 arXiv:0910.1098 --- z-dropout
Castellano et al. 2009 arXiv:0909.2853 --- z-dropout
Hickey et al. 2009 arXiv:0909.4205 --- Y&z-dropout
Ouchi et al. 2009 arXiv:0908.3191 --- z-dropout
Capak et al. 2009 arXiv:0910.0444 --- z-dropout
Lyman break featureLyman break feature
Lyman break
U-dropout
z~4
Previous studies of z~7 LBGs Previous studies of z~7 LBGs
Bouwens et al. 2008
z~7z~7--8 LBG8 LBG HUDF: HST/WFC3 HUDF: HST/WFC3
McLure et al. 2009 arXiv:0909.2437 --- photo-z SED fitting
Labbe et al. 2009 arXiv:0910.0838 --- +IRAC stellar mass
Oesch et al. 2009 arXiv:0909.5183 --- morphology
GOODSGOODS--S: HST/WFC3S: HST/WFC3
GOODSGOODS--S: VLT/HAWKS: VLT/HAWK--II
Wilkins et al. 2009 arXiv:0910.1098 --- z-dropout
Castellano et al. 2009 arXiv:0909.2853 --- z-dropout
Hickey et al. 2009 arXiv:0909.4205 --- Y&z-dropout
Ouchi et al. 2009 arXiv:0908.3191 --- z-dropout
Capak et al. 2009 arXiv:0910.0444 --- z-dropout
BouwensBouwens et al. arXiv:09091803et al. arXiv:09091803
HUDFHUDF HST/WFC3 HST/WFC3 YY--dropout dropout
Hubble Ultra Deep Field HST/ACS z-band image
HST/WFC3
HST/NICMOS J&H-bands
Y, J, H-bands
VLT/ISAAC Magellan/PANIC Ks-band
McLure et al.
HST/WFC3 data HST/WFC3 data
HUDF09 program first epoch data (August 26 ~ September 6, 2009)
F125W J --- 16 orbits F160W H --- 28 orbits
(two UDF05 fields will be also observed in 2010)
PSF FWHM ~ 0.2” 5σ limit @ 0.4” diameter ~ 29ABmag
(1 orbit ~ 40min)
~ 4.7 arcmin2
YY--dropout selection dropout selection
Source detection J + H combined image >5.5σ in J band
Color selection • Y-J > 0.8 • J-H < 0.5
• J-H < 0.2 + 0.12×(Y-J) • no detection (<2σ) in B,V,i,z (those with 1.5~2σ detection in more
than one optical band were rejected)
BouwensBouwens et al. arXiv:09091803et al. arXiv:09091803
selected z~8 candnoidates selected z~8 candnoidates
5 candidates
>5σ in J & >4σ in H
All WFC3 data were obrained in 12days
brown dwarfs are more bluer and rare
Simulation with 24.5~26mag objects
Possible contaminants
Not galactic stars
the expected number of, contaminants by photometric scatter is very small (<~0.2)
BouwensBouwens et al. arXiv:09091803et al. arXiv:09091803
selected z~8 candidates selected z~8 candidates
5 candidates
H~28.2-29.2 mag
Number counts Number counts
• (1+z)-1 size evolution from z~4
• UV slope β=-2.5±0.4 are assumed. are assumed.
z~6 i-dropout LF 24 Y-dropouts
z~7 z-dropout LF 11 Y-dropouts
(~70% statistical error
~35% field-to-field variance)
Evolution of UV LF Evolution of UV LF
Extraoplation of UV LF at z<7 to z~8
M* UV~-19.45, φ*~0.0011Mpc-3, α~-1.74
good agreement with the observed results
Fit M* UV with the observed data
φ*~0.0011Mpc-3, α~-1.74 are assumed
M* UV = -19.3±0.3
M* UV = -21 @z~4
Stepwise LF
strong evolution of M* (?)
SFR density at z~8 SFR density at z~8
Integrate the stepwise UV LF
UV luminosity density
estimated at z~5-6 )
z~6z~6--9 galaxy search with HUDF HST/WFC3 9 galaxy search with HUDF HST/WFC3
McLureMcLure et al. arXiv:0909.2437et al. arXiv:0909.2437
HST/WFC3
HST/ACS
Y, J, H-bands
Bouwens et al. PSF FWHM ~ 0.15”(Y), 0.16”(J), 0.18”(H)
5σ limit @0.4” diameter ~29ABmag
HST/ACS
Spizter/IRAC
(~28mag for z-band)
5σ limit ~25.9(3.6µm)
Source detection
• No detection (2σ) in i-band
300 objects
Photometric redshift
300 objects
Charlot & Bruzal 2007 templates
Photometric redshift
Calzetti extinction
49 candidates
SED
magnitude
Contamination by T dwarfs
in 4.5arcmin2 WFC3 field
(not detected at all
49 z>6 candidates
No detection in i-band
including
all 5 Y-dropouts in Bouwens et al.
The faintest z-dropout candidate in Oesch et al.
+ additional 15 z>6.25 candidates
extremely highextremely high--z sample z sample
McLureMcLure et al. arXiv:0909.2437et al. arXiv:0909.2437
15 z>7 candidates
8 z>7.5 candidates
J~28-29mag
these 5 have acceptable secondary peak at z~1.6
4 z>7.8 candidates occur in two pairs
extremely highextremely high--z sample z sample
McLureMcLure et al. arXiv:0909.2437et al. arXiv:0909.2437
15 z>7 candidates
8 z>7.5 candidates
J~28-29mag
these 5 have acceptable secondary peak at z~1.6
4 z>7.8 candidates occur in two pairs
extremely highextremely high--z sample z sample
McLureMcLure et al. arXiv:0909.2437et al. arXiv:0909.2437
15 z>7 candidates
8 z>7.5 candidates
J~28-29mag
these 5 have acceptable secondary peak at z~1.6
4 z>7.8 candidates occur in two pairs
For the faintest candidates (J, H ~29),
no detection in optical ACS images is
not sufficient to pick up Lyman break
exclusively.
redshift probability distribution +
7.5<z<8.5
z~7 UVLF
z~8 UVLF
M* 1500 ~ -20.11
Φ* ~ 0.0007 Mpc-3
• number density evolution of
• cannot constrain the shape of UVLF
• Number density at M1500~-19.5 is a factor of ~2
smaller than at z~7
Castellano et al. arXiv:0909.2583Castellano et al. arXiv:0909.2583
zz--dropout search in GOODSdropout search in GOODS--S with HAWKS with HAWK--II Great Observatories Origins Deep Survey - South
• deep HST/ACS optical images
• deep Spizter/IRAC MIR images
• Chandra
• Spitzer/MIPS
VLT/HAWKVLT/HAWK--I dataI data HAWK-I 7.5’ x 7.5’ F.O.V 0.106”/pix
Y-band 2 pointings Science Verification & ESO Large Program
GOODS1 --- 16.25 hour 0.514” FWHMGOODS1 --- 16.25 hour 0.514” FWHM
GOODS2 --- 16.93 hour 0.489” FWHM
~89.7arcmin2 ~100% complete at Y~26.2
~30%compete at Y~26.8
spurious source negligible at Y<26.5
~10% at Y~26.8
HST/ACS B, V, i, z-bands(29.0, 29.1,28.6,28.2)
VLT/ISAAC J, H, K-bands (26.6,26.2,26.2)
1σ limitMulti-wavelength data
sample selectionsample selection Y-selected Y<26.7
Y-J>1.0
ACS z-band HAWK-I
Castellano et al. arXiv:0909.2583Castellano et al. arXiv:0909.2583
sample selectionsample selection Y-selected Y<26.7
Y-J>1.0 detect z>6.5 Lyα break
Y-J<1.5 & Y-K<2.0
reject old/dusty galaxies at z~1-4
Castellano et al. arXiv:0909.2583Castellano et al. arXiv:0909.2583
sample selectionsample selection Y-selected Y<26.7
Y-J>1.0 detect z>6.5 Lyα break
Y-J<1.5 & Y-K<2.0
No detection in optical
reject old/dusty galaxies at z~1-4
One of interlopers with z-Y>1
<2σ in all UBVRI-bands
139 9 candidates
Simulation for sample selectionSimulation for sample selection add artificial objects with Y=24-27.5 at z=5.5-8 (assuming size and LF of z~5.5-6 LBGs)
Castellano et al. arXiv:0909.2583Castellano et al. arXiv:0909.2583
Selected candidatesSelected candidates 9 z~7 candidates
1 known cool dwarf is rejected
(relatively red Y-J color)
expected contamination ~3.4 cool dwarfsexpected contamination ~3.4 cool dwarfs for 2 HAWK-I F.O.V.
another one which is not detected in the
deep NICMOS H-band (Y-H<-1) is rejected
7 candidates
Castellano et al. arXiv:0909.2583Castellano et al. arXiv:0909.2583 B+V+i z Y J+H+K F110W F160W 3.6µm
Castellano et al. arXiv:0909.2583Castellano et al. arXiv:0909.2583
Selected candidatesSelected candidates
Number CountsNumber Counts
Observed number counts of z~6.8 LBGs are smaller than predictions from z~6 LFs.
(No evolution for UV LF(No evolution for UV LF
between z~6 and z~6.8)
UV LF seems to evolve
between z~6 and z~6.8
Castellano et al. arXiv:0909.2583Castellano et al. arXiv:0909.2583
UV luminosity functionUV luminosity function
Assumed UV Luminosity function
M*(1500) = -20.24±0.45 assuming α=-1.71
Castellano et al. arXiv:0909.2583Castellano et al. arXiv:0909.2583
Evolution of UV LFEvolution of UV LF
Evolution between
M*(1500) = -20.24±0.45 assuming α=-1.71
d(logΦ*)/dz = -0.59±0.25 dM*/dz = 0.13±0.51
Evolution between
ρUV = 1.5+2.0 -0.9×1025 erg/s/Hz/Mpc3
UV luminosity density
rule out no evolution between z~6 and z~6.8
at 99% confidence level
Ouchi et al. arXiv:0908.3191Ouchi et al. arXiv:0908.3191
zz--dropout search in SDF & GOODSdropout search in SDF & GOODS--N with N with Subaru/SSubaru/S--CamCam
GOODS-North Subaru Deep Field
SuprimeSuprime--Cam dataCam data
Subaru Deep Field 26 hours 810 arcmin2
GOODS-North 33 hours 758 arcmin2
3σ limit @ 1.8” diameter SDF 26.4 ABmag
GOODS-N 26.2 ABmag
GOODS-N 26.9 mag
Sample selectionSample selection • y-selected samaple
>4σ limit SDF y<26.1
GOODS-N y<25.9
• z’-y > 1.5
<2σ limit SDF 29.4(B), 28.6(V), 28.8(R)
GOODS-N 27.3(U), 28.0(B), 26.7(V), 27.0(R)
Ouchi et al. arXiv:0908.3191Ouchi et al. arXiv:0908.3191
Selected candidatesSelected candidates 15+7=22 candidates
all candidates have y>25.4mag
1 (brightest) candidate zspec=6.96
GOODS-N SDF
Selected candidatesSelected candidates detection completeness ~70%@y=25.5
>50%@y~25.8
Expected contamination
~1 spurious source
~0.1 transient object
~1 lower-z galaxies with photometric error~1 lower-z galaxies with photometric error
~8 L/T-type dwarfs
redshift selection function
UV luminosity function
at bright magnitude
Φ* = 1.10+2.79 -0.79×10-3 Mpc-3
M* = -19.9±0.7 α = -1.66±1.32α = -1.66±1.32
Evolution between z~6 and z~7
at >2σ level
UV luminosity densityUV luminosity density integrating UV LF
2.7+6.9 -1.9×1026 erg/s/Hz/Mpc3
3.4+8.6 -2.4×10-3 M/yr/Mpc3
SFR density
evolution of a factor of >10 between z~2-3 and z~7
SFRD decreases even from z~6 to z~7.
Ouchi et al. arXiv:0908.3191Ouchi et al. arXiv:0908.3191
Spatial distributionSpatial distribution
especially for UV bright LBGs
SummarySummary
z-dropout
(z~7)
GOODS-N&SDF Subaru/SCam ~1568 Y<26 ~22 (~12)
UV luminosity density (LBG number density)
z~6 (i-dropout)
z~7 (z-dropout)
z~8 (Y-dropout)
decrease
Size evolution Surface SFR density
LabbeLabbe et al. arXiv:0910.0838et al. arXiv:0910.0838
McLure et al. 2009 arXiv:0909.2437 --- photo-z SED fitting
Labbe et al. 2009 arXiv:0910.0838 --- +IRAC stellar mass
Oesch et al. 2009 arXiv:0909.5183 --- morphology
GOODSGOODS--S: HST/WFC3S: HST/WFC3
GOODSGOODS--S: VLT/HAWKS: VLT/HAWK--II
Wilkins et al. 2009 arXiv:0910.1098 --- z-dropout
Castellano et al. 2009 arXiv:0909.2853 --- z-dropout
Hickey et al. 2009 arXiv:0909.4205 --- Y&z-dropout
Ouchi et al. 2009 arXiv:0908.3191 --- z-dropout
Capak et al. 2009 arXiv:0910.0444 --- z-dropout
Lyman break featureLyman break feature
Lyman break
U-dropout
z~4
Previous studies of z~7 LBGs Previous studies of z~7 LBGs
Bouwens et al. 2008
z~7z~7--8 LBG8 LBG HUDF: HST/WFC3 HUDF: HST/WFC3
McLure et al. 2009 arXiv:0909.2437 --- photo-z SED fitting
Labbe et al. 2009 arXiv:0910.0838 --- +IRAC stellar mass
Oesch et al. 2009 arXiv:0909.5183 --- morphology
GOODSGOODS--S: HST/WFC3S: HST/WFC3
GOODSGOODS--S: VLT/HAWKS: VLT/HAWK--II
Wilkins et al. 2009 arXiv:0910.1098 --- z-dropout
Castellano et al. 2009 arXiv:0909.2853 --- z-dropout
Hickey et al. 2009 arXiv:0909.4205 --- Y&z-dropout
Ouchi et al. 2009 arXiv:0908.3191 --- z-dropout
Capak et al. 2009 arXiv:0910.0444 --- z-dropout
BouwensBouwens et al. arXiv:09091803et al. arXiv:09091803
HUDFHUDF HST/WFC3 HST/WFC3 YY--dropout dropout
Hubble Ultra Deep Field HST/ACS z-band image
HST/WFC3
HST/NICMOS J&H-bands
Y, J, H-bands
VLT/ISAAC Magellan/PANIC Ks-band
McLure et al.
HST/WFC3 data HST/WFC3 data
HUDF09 program first epoch data (August 26 ~ September 6, 2009)
F125W J --- 16 orbits F160W H --- 28 orbits
(two UDF05 fields will be also observed in 2010)
PSF FWHM ~ 0.2” 5σ limit @ 0.4” diameter ~ 29ABmag
(1 orbit ~ 40min)
~ 4.7 arcmin2
YY--dropout selection dropout selection
Source detection J + H combined image >5.5σ in J band
Color selection • Y-J > 0.8 • J-H < 0.5
• J-H < 0.2 + 0.12×(Y-J) • no detection (<2σ) in B,V,i,z (those with 1.5~2σ detection in more
than one optical band were rejected)
BouwensBouwens et al. arXiv:09091803et al. arXiv:09091803
selected z~8 candnoidates selected z~8 candnoidates
5 candidates
>5σ in J & >4σ in H
All WFC3 data were obrained in 12days
brown dwarfs are more bluer and rare
Simulation with 24.5~26mag objects
Possible contaminants
Not galactic stars
the expected number of, contaminants by photometric scatter is very small (<~0.2)
BouwensBouwens et al. arXiv:09091803et al. arXiv:09091803
selected z~8 candidates selected z~8 candidates
5 candidates
H~28.2-29.2 mag
Number counts Number counts
• (1+z)-1 size evolution from z~4
• UV slope β=-2.5±0.4 are assumed. are assumed.
z~6 i-dropout LF 24 Y-dropouts
z~7 z-dropout LF 11 Y-dropouts
(~70% statistical error
~35% field-to-field variance)
Evolution of UV LF Evolution of UV LF
Extraoplation of UV LF at z<7 to z~8
M* UV~-19.45, φ*~0.0011Mpc-3, α~-1.74
good agreement with the observed results
Fit M* UV with the observed data
φ*~0.0011Mpc-3, α~-1.74 are assumed
M* UV = -19.3±0.3
M* UV = -21 @z~4
Stepwise LF
strong evolution of M* (?)
SFR density at z~8 SFR density at z~8
Integrate the stepwise UV LF
UV luminosity density
estimated at z~5-6 )
z~6z~6--9 galaxy search with HUDF HST/WFC3 9 galaxy search with HUDF HST/WFC3
McLureMcLure et al. arXiv:0909.2437et al. arXiv:0909.2437
HST/WFC3
HST/ACS
Y, J, H-bands
Bouwens et al. PSF FWHM ~ 0.15”(Y), 0.16”(J), 0.18”(H)
5σ limit @0.4” diameter ~29ABmag
HST/ACS
Spizter/IRAC
(~28mag for z-band)
5σ limit ~25.9(3.6µm)
Source detection
• No detection (2σ) in i-band
300 objects
Photometric redshift
300 objects
Charlot & Bruzal 2007 templates
Photometric redshift
Calzetti extinction
49 candidates
SED
magnitude
Contamination by T dwarfs
in 4.5arcmin2 WFC3 field
(not detected at all
49 z>6 candidates
No detection in i-band
including
all 5 Y-dropouts in Bouwens et al.
The faintest z-dropout candidate in Oesch et al.
+ additional 15 z>6.25 candidates
extremely highextremely high--z sample z sample
McLureMcLure et al. arXiv:0909.2437et al. arXiv:0909.2437
15 z>7 candidates
8 z>7.5 candidates
J~28-29mag
these 5 have acceptable secondary peak at z~1.6
4 z>7.8 candidates occur in two pairs
extremely highextremely high--z sample z sample
McLureMcLure et al. arXiv:0909.2437et al. arXiv:0909.2437
15 z>7 candidates
8 z>7.5 candidates
J~28-29mag
these 5 have acceptable secondary peak at z~1.6
4 z>7.8 candidates occur in two pairs
extremely highextremely high--z sample z sample
McLureMcLure et al. arXiv:0909.2437et al. arXiv:0909.2437
15 z>7 candidates
8 z>7.5 candidates
J~28-29mag
these 5 have acceptable secondary peak at z~1.6
4 z>7.8 candidates occur in two pairs
For the faintest candidates (J, H ~29),
no detection in optical ACS images is
not sufficient to pick up Lyman break
exclusively.
redshift probability distribution +
7.5<z<8.5
z~7 UVLF
z~8 UVLF
M* 1500 ~ -20.11
Φ* ~ 0.0007 Mpc-3
• number density evolution of
• cannot constrain the shape of UVLF
• Number density at M1500~-19.5 is a factor of ~2
smaller than at z~7
Castellano et al. arXiv:0909.2583Castellano et al. arXiv:0909.2583
zz--dropout search in GOODSdropout search in GOODS--S with HAWKS with HAWK--II Great Observatories Origins Deep Survey - South
• deep HST/ACS optical images
• deep Spizter/IRAC MIR images
• Chandra
• Spitzer/MIPS
VLT/HAWKVLT/HAWK--I dataI data HAWK-I 7.5’ x 7.5’ F.O.V 0.106”/pix
Y-band 2 pointings Science Verification & ESO Large Program
GOODS1 --- 16.25 hour 0.514” FWHMGOODS1 --- 16.25 hour 0.514” FWHM
GOODS2 --- 16.93 hour 0.489” FWHM
~89.7arcmin2 ~100% complete at Y~26.2
~30%compete at Y~26.8
spurious source negligible at Y<26.5
~10% at Y~26.8
HST/ACS B, V, i, z-bands(29.0, 29.1,28.6,28.2)
VLT/ISAAC J, H, K-bands (26.6,26.2,26.2)
1σ limitMulti-wavelength data
sample selectionsample selection Y-selected Y<26.7
Y-J>1.0
ACS z-band HAWK-I
Castellano et al. arXiv:0909.2583Castellano et al. arXiv:0909.2583
sample selectionsample selection Y-selected Y<26.7
Y-J>1.0 detect z>6.5 Lyα break
Y-J<1.5 & Y-K<2.0
reject old/dusty galaxies at z~1-4
Castellano et al. arXiv:0909.2583Castellano et al. arXiv:0909.2583
sample selectionsample selection Y-selected Y<26.7
Y-J>1.0 detect z>6.5 Lyα break
Y-J<1.5 & Y-K<2.0
No detection in optical
reject old/dusty galaxies at z~1-4
One of interlopers with z-Y>1
<2σ in all UBVRI-bands
139 9 candidates
Simulation for sample selectionSimulation for sample selection add artificial objects with Y=24-27.5 at z=5.5-8 (assuming size and LF of z~5.5-6 LBGs)
Castellano et al. arXiv:0909.2583Castellano et al. arXiv:0909.2583
Selected candidatesSelected candidates 9 z~7 candidates
1 known cool dwarf is rejected
(relatively red Y-J color)
expected contamination ~3.4 cool dwarfsexpected contamination ~3.4 cool dwarfs for 2 HAWK-I F.O.V.
another one which is not detected in the
deep NICMOS H-band (Y-H<-1) is rejected
7 candidates
Castellano et al. arXiv:0909.2583Castellano et al. arXiv:0909.2583 B+V+i z Y J+H+K F110W F160W 3.6µm
Castellano et al. arXiv:0909.2583Castellano et al. arXiv:0909.2583
Selected candidatesSelected candidates
Number CountsNumber Counts
Observed number counts of z~6.8 LBGs are smaller than predictions from z~6 LFs.
(No evolution for UV LF(No evolution for UV LF
between z~6 and z~6.8)
UV LF seems to evolve
between z~6 and z~6.8
Castellano et al. arXiv:0909.2583Castellano et al. arXiv:0909.2583
UV luminosity functionUV luminosity function
Assumed UV Luminosity function
M*(1500) = -20.24±0.45 assuming α=-1.71
Castellano et al. arXiv:0909.2583Castellano et al. arXiv:0909.2583
Evolution of UV LFEvolution of UV LF
Evolution between
M*(1500) = -20.24±0.45 assuming α=-1.71
d(logΦ*)/dz = -0.59±0.25 dM*/dz = 0.13±0.51
Evolution between
ρUV = 1.5+2.0 -0.9×1025 erg/s/Hz/Mpc3
UV luminosity density
rule out no evolution between z~6 and z~6.8
at 99% confidence level
Ouchi et al. arXiv:0908.3191Ouchi et al. arXiv:0908.3191
zz--dropout search in SDF & GOODSdropout search in SDF & GOODS--N with N with Subaru/SSubaru/S--CamCam
GOODS-North Subaru Deep Field
SuprimeSuprime--Cam dataCam data
Subaru Deep Field 26 hours 810 arcmin2
GOODS-North 33 hours 758 arcmin2
3σ limit @ 1.8” diameter SDF 26.4 ABmag
GOODS-N 26.2 ABmag
GOODS-N 26.9 mag
Sample selectionSample selection • y-selected samaple
>4σ limit SDF y<26.1
GOODS-N y<25.9
• z’-y > 1.5
<2σ limit SDF 29.4(B), 28.6(V), 28.8(R)
GOODS-N 27.3(U), 28.0(B), 26.7(V), 27.0(R)
Ouchi et al. arXiv:0908.3191Ouchi et al. arXiv:0908.3191
Selected candidatesSelected candidates 15+7=22 candidates
all candidates have y>25.4mag
1 (brightest) candidate zspec=6.96
GOODS-N SDF
Selected candidatesSelected candidates detection completeness ~70%@y=25.5
>50%@y~25.8
Expected contamination
~1 spurious source
~0.1 transient object
~1 lower-z galaxies with photometric error~1 lower-z galaxies with photometric error
~8 L/T-type dwarfs
redshift selection function
UV luminosity function
at bright magnitude
Φ* = 1.10+2.79 -0.79×10-3 Mpc-3
M* = -19.9±0.7 α = -1.66±1.32α = -1.66±1.32
Evolution between z~6 and z~7
at >2σ level
UV luminosity densityUV luminosity density integrating UV LF
2.7+6.9 -1.9×1026 erg/s/Hz/Mpc3
3.4+8.6 -2.4×10-3 M/yr/Mpc3
SFR density
evolution of a factor of >10 between z~2-3 and z~7
SFRD decreases even from z~6 to z~7.
Ouchi et al. arXiv:0908.3191Ouchi et al. arXiv:0908.3191
Spatial distributionSpatial distribution
especially for UV bright LBGs
SummarySummary
z-dropout
(z~7)
GOODS-N&SDF Subaru/SCam ~1568 Y<26 ~22 (~12)
UV luminosity density (LBG number density)
z~6 (i-dropout)
z~7 (z-dropout)
z~8 (Y-dropout)
decrease
Size evolution Surface SFR density
LabbeLabbe et al. arXiv:0910.0838et al. arXiv:0910.0838